Reika, who remarried a husband much older than herself, started a new family with her stepson, Tatsuya. She quickly bonded with Tatsuya, who is closer in age to her, and they became close like real parent and child. However, due to their closeness, Tatsuya came to see her as a woman. When her husband goes on a business trip for a week, their stepparent-child relationship becomes entangled…